PixArt Imaging Inc.
PAS005B
CMOS Image Sensor IC
Mechanical shutter
opening period
Mechanical
shutter
Exposure start point
programmed by ny, ne
start point
end point
Active exposure time
Image exposure and
readout timing
Array
reset
Array
leakage
Vsync extension
programmed by LPF
Non-Valid
Data
Valid
Data
Vsync
External Sync
Fig. 4.4-2 Snapshot mode two – Exposure time smaller than shutter speed limitation.
4.5 External synchronization control
The sensor core timing can be reset by external “Sync” pin. The internal counter will start from initial point at
the rising edge of trigger signal “Sync”. Meanwhile, Vsync signal is reset to zero. Waiting the coming of
Vsync pulse, a valid frame will be output after the pulse with the programmed ny, ne and gain code, as shown
in Figs. 4.4-1 and 4.4-2.
4.6 Frame rate
1
Frame rate =
(LPF +1+ 2) ⋅t _ line
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PixArt Imaging Inc.
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